Pick whichever course most interests you. Do you plan to practise law? The law of evidence can sometimes be interesting, but it's not as interesting as some other subjects. In the practice of law in England and Wales, the law of evidence is mainly relevant to criminal litigators. In civil litigation, the rules of evidence are relatively relaxed, these days, not least because civil cases are tried by Judges without juries. I would regard financial crime and media law as more interesting and useful than criminology, but so whatever gets you going.